Dynamic imbalanced force generator and an actuator comprising such a generator

Abstract

A dynamic imbalanced force generator includes a pair of eccentric masses and a shaft frame. The generator further includes at least one support plate of a motor arranged radially with respect to the shaft frame, and a gear system. A second imbalance is arranged between a first imbalance and the shaft frame, and coaxially with respect to the first imbalance. At least one motor is supported by the plate and engaged with at least one of the first and second imbalances by the gear system. The support plate and the motor are arranged between the imbalances and the shaft frame.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 
     
       1. A dynamic imbalanced force generator, comprising:
 a shaft frame having a longitudinal axis and having; 
 at least one support plate of a motor arranged radially with respect to the longitudinal axis of the shaft frame; and 
 a gear system, 
 wherein the shaft frame carries: 
 a first imbalance comprising a mass eccentric with respect to the shaft frame and rotatably connected to the shaft frame formed by two arms of which one is fixed to the gear system; 
 a second imbalance comprising a mass eccentric to the shaft frame and rotatably connected to the shaft frame by an arm attached to the gear system, wherein the second imbalance is arranged coaxially with the first imbalance between the first imbalance and the shaft frame; and 
 at least one motor supported by the support plate and engaged with at least one of the first and second imbalances via the gear system, wherein the support plate and the motor are arranged between the imbalances and the shaft frame and between an arm of the first imbalance and an arm of the second imbalance. 
 
     
     
       2. The dynamic imbalanced force generator according to  claim 1 , wherein the shaft frame comprises:
 at least two motor support plates arranged radially with respect to the longitudinal axis of the shaft frame; 
 wherein each of the motors is supported by a support plate and each of the motors is engaged with one of the first and second imbalances via the gear system, wherein at least one first motor is engaged with one of the first or second imbalances, and wherein at least one second motor is engaged with the other of the first or second imbalances. 
 
     
     
       3. The dynamic imbalanced force generator according to  claim 2 , wherein the shaft frame comprises:
 two motor support plates arranged radially with respect to the longitudinal axis of the shaft frame, 
 wherein a first and second motor is respectively supported by a support plate and is engaged with only one of the first and second imbalances via the gear system; 
 wherein the generator further comprises a control unit designed to control a counter-rotation of the first and second motors electronically. 
 
     
     
       4. The dynamic imbalanced force generator according to  claim 3 , wherein the gear system comprises two reduction gears each comprising two toothed wheels of different diameters, a toothed wheel of larger diameter and a toothed wheel of smaller diameter, wherein each larger diameter toothed wheel is fixed to a different imbalance and meshes with a smaller diameter toothed wheel, and wherein each smaller diameter toothed wheel is attached to one end of a drive shaft of a different motor. 
     
     
       5. The dynamic imbalance force generator according to  claim 4 , wherein each smaller-diameter toothed wheel comprises an externally-toothed wheel fixed to one end of a drive shaft of a different motor, while the larger diameter toothed wheels of two reduction gears comprise of two externally-toothed wheels, two inner-toothed rings, or an externally-toothed wheel and an internally-toothed ring. 
     
     
       6. The dynamic imbalanced force generator according to  claim 3 , wherein one of the support arms of the first imbalance is fastened to a larger first toothed wheel, while the other support arm of the first imbalance is secured to a collar rotatably-mounted on the shaft frame by means of a bearing, and the support arm of the second imbalance is fixed to a second toothed wheel of larger diameter. 
     
     
       7. The dynamic imbalanced force generator according to  claim 1 , wherein the motor comprises a traverse shaft, each end of which is engaged with one of the first and second imbalances via the gear system, wherein the gear system comprises two reduction gears each comprising two toothed wheels of different diameters, wherein the two smaller diameter toothed wheels are respectively fixed to one end of the motor shaft and respectively mesh with one of the two toothed wheels of larger diameter, wherein the latter are also respectively engaged with a different imbalance. 
     
     
       8. The dynamic imbalanced force generator according to  claim 7 , wherein one of the support arms of the first imbalance is fixed to a first toothed wheel of larger diameter, while the other support arm of the first imbalance is fastened to a collar which is rotatably mounted on the shaft by means of a bearing, and wherein the support arm of the second imbalance is fixed to a second toothed of larger diameter. 
     
     
       9. The dynamic imbalanced force generator according to  claim 7 , wherein the toothed wheels of smaller diameter of the reduction gears comprise wheels with external toothing, and wherein the toothed wheels of larger diameter comprises of an externally toothed wheel and an internally toothed ring gear. 
     
     
       10. The dynamic imbalanced force generator according to  claim 9 , wherein one of the support arms of the first imbalance is fixed to the externally toothed wheel, while the other support arm of the first imbalance is fixed to a collar mounted rotatably on the shaft formed by a bearing, while the support arm of the second imbalance is fixed to the internally toothed ring gear. 
     
     
       11. The dynamic imbalanced force generator according to  claim 9 , wherein one of the support arms of the first imbalance is fixed to the internally toothed ring gear, while the other support arm of the first imbalance is fixed to a collar mounted rotatably on the shaft formed by a bearing, and wherein the support arm of the second imbalance is fixed to the externally toothed wheel. 
     
     
       12. The dynamic imbalanced force generator according to  claim 1 , wherein the shaft frame comprises a first support arm of a first bearing, wherein the first bearing arm is arranged radially with respect to the longitudinal axis of the shaft frame, and wherein a mechanical coupling axle is rotatably supported by the first bearing arm for coupling the gear system so that the first and the second imbalance counter-rotate in use. 
     
     
       13. The dynamic imbalanced force generator according to  claim 12 , wherein the motor has a shaft end engaged with one of the first and second imbalances by means of the gear system, wherein the gear system comprises:
 a first reduction gear comprising two toothed wheels of different diameters, wherein the toothed wheel of smaller diameter is fixed, on the one hand, to the end of the motor shaft and, on the other hand, meshes with the larger-diameter toothed wheel, wherein the latter is fixed to the first or the second imbalance; 
 a second reduction gear comprising two toothed wheels of different diameters, wherein the toothed wheel of larger diameter is fixed to the other imbalance, 
 wherein a first end of the coupling axle is fixed to the smaller diameter toothed wheel of the second reduction gear which meshes with the larger diameter toothed wheel of the second reduction gear, 
 wherein a second end of the coupling axle is fastened to a toothed wheel meshed with the larger diameter toothed wheel of the first reduction gear, so that the imbalances are mechanically coupled and mounted counter-rotatably relative to one another. 
 
     
     
       14. The dynamic imbalanced force generator according to  claim 12 , wherein the shaft frame comprises:
 at least three support plates to support a motor arranged radially with respect to the longitudinal axis of the shaft frame; 
 as many motors as there are support plates, wherein each is supported by a support plate and each engages with one of the first and second imbalances via the gear system, wherein at least one first and one second motor is in engagement with one of the first or second imbalances, and wherein at least one third motor is in engagement with the other of the first or second imbalance. 
 
     
     
       15. The dynamic imbalanced force generator according to  claim 14 , wherein the gear system comprises:
 a first reduction gear and a second reduction gear, respectively comprising of two toothed wheels of different diameters, wherein the smaller diameter toothed wheel is fixed, on the one hand, to the end of the first and second shafts of the motors, while, on the other hand, meshing with the larger diameter toothed wheels, wherein the latter are fixed to the first or the second imbalance; 
 a third reduction gear comprising two toothed wheels of different diameters, wherein the toothed wheel of smaller diameter is fixed, on the one hand, to the end of the shaft of the third motor, while, on the other hand, meshing with the toothed wheel of larger diameter, wherein the latter is fixed to the other imbalance, 
 a fourth and a fifth reduction gear, each comprising two toothed wheels of different diameters, 
 a first end of the coupling axle is meshed with one of the first and second imbalances via the fourth reduction gear, 
 a second end of the coupling axle is engaged via the fifth reduction gear with the other end of the first and second imbalances, so that the imbalances are mechanically coupled and mounted counter-rotatably with respect to one another. 
 
     
     
       16. The dynamic imbalanced force generator according to  claim 12 , wherein the shaft further comprises a second support arm of a second bearing, wherein the second bearing arm is arranged radially with respect to the longitudinal axis of the shaft frame, so that the first and second bearings are coaxially aligned and the mechanical coupling axle is rotatably supported by the two bearings. 
     
     
       17. The dynamic imbalanced force generator according to  claim 12 , wherein the toothed wheels of smaller diameter of the reduction gears comprise externally toothed wheels and the toothed wheels of larger diameter comprise an externally toothed wheel and an internally toothed ring gear. 
     
     
       18. The dynamic imbalanced force generator according to  claim 17 , wherein one of the support arms of the first imbalance is fixed to the externally toothed wheel, while the other support arm of the first imbalance is fixed to a collar mounted rotatably on the shaft frame by means of a bearing, and wherein the support arm of the second imbalance is fixed to the internally toothed ring gear. 
     
     
       19. The dynamic imbalanced force generator according to  claim 17 , wherein one of the support arms of the first imbalance is fixed to the internally toothed ring gear, while the other support arm of the first imbalance is fixed to a collar mounted rotatably on the shaft frame by means of a bearing, and wherein the support arm of the second imbalance is fixed to the externally toothed wheel. 
     
     
       20. The dynamic imbalanced force generator according to  claim 1 , wherein an electrical circuit for supplying the at least one motor extends partly inside the shaft frame, while the other part exiting from the shaft frame extends through at least one transverse opening as far as the motor(s). 
     
     
       21. An actuator comprising two generators according to  claim 1 , in which the generators are arranged in a side-by-side arrangement, wherein the two shaft frames are parallel to one another and electronically coupled. 
     
     
       22. An actuator comprising two generators according to  claim 1 , wherein the generators are arranged one above the other in the operational position, wherein the two shaft frames are parallel to one another and mechanically coupled.